New
New
Year 5
Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication
I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.
New
New
Year 5
Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication
I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.
Lesson details
Key learning points
- Use times tables and place value to estimate the product of a 2-digit by a 1-digit multiplication.
- Use expanded short multiplication to multiply a 2-digit by a 1-digit number.
- Use short multiplication to multiply a 2-digit by a 1-digit number.
Common misconception
Pupils may find it difficult to identify the multiples of 10 a number is between when estimating.
Provide a number line and continue to use stem sentences to support pupils in their thinking.
Keywords
Estimation - To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation.
Estimation is a key skill and should be modelled clearly, with pupils encouraged to use estimation at every opportunity. Take time to model your 'thinking aloud' process while estimating.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
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6 Questions
Q1.
483 can be partitioned as __________.
4 tens, 8 tens and 3 ones.
4 hundreds, 7 tens and 3 ones.
4 hundreds, 80 tens and 3 ones.
Q2.
Izzy is chanting her 7 times tables: ... 21, 28, 35, ___. What comes next?
40
41
43
Q3.
Izzy is chanting her 7 times tables in descending order: ... 77, 70, 63, . What comes next?
Q4.
Use short multiplication to calculate this question: 56 × 3 =
Q5.
Use expanded multiplication to calculate this question: 74 × 5=
Q6.
Sam has 71 shiny cards, Izzy has 213 shiny cards. Izzy has times as many.
Exit quiz
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6 Questions
Q1.
To estimate for the calculation: 4 × 72, 72 is between __________.
60 and 70
65 and 70
Q2.
Select the correct number to complete the estimation.
28
74
208
Q3.
Write the correct number to complete the estimation.
Q4.
Select an appropriate estimation for 63 × 3
65 × 3
70 × 3
6 × 3
Q5.
Use estimation to decide which has a suitable answer for this multiplication: 46 × 3
B
Q6.
Solve the worded problem using short multiplication: In one month 34 cups of lemonade are sold. The following month, six times as many are sold. How many cups of lemonade were sold that month?